KR20170001888A - Charging device for H-bridge level inverter and method for charging power cell of H-bridge Multi level inverter using the same - Google Patents

Charging device for H-bridge level inverter and method for charging power cell of H-bridge Multi level inverter using the same Download PDF

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Publication number
KR20170001888A
KR20170001888A KR1020150091354A KR20150091354A KR20170001888A KR 20170001888 A KR20170001888 A KR 20170001888A KR 1020150091354 A KR1020150091354 A KR 1020150091354A KR 20150091354 A KR20150091354 A KR 20150091354A KR 20170001888 A KR20170001888 A KR 20170001888A
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South Korea
Prior art keywords
power
inverter
bridge
level inverter
charging
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KR1020150091354A
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Korean (ko)
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KR102056239B1 (en
Inventor
이현원
박영민
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현대중공업 주식회사
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H02M7/49—Combination of the output voltage waveforms of a plurality of converters
    • H02M2001/0038—
    • H02M2007/4835—

Abstract

An H-bridge multi-level inverter charging apparatus according to an embodiment of the present invention charges an H-bridge multi-level inverter to which system power is applied through a power input device, comprising: a transformer for converting an inverter control power source to a predetermined size; A switching unit for applying or interrupting the inverter control power converted into the predetermined magnitude through the switching operation to any one of the input transformer secondary multi-winding of the H bridge multi-level inverter; And a controller for controlling the operation of the switching unit according to whether the system power is applied through the power input device.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a charging device for an H-bridge multi-level inverter and an H-bridge multi-level inverter using the same,

The present invention relates to a charging device for an H-bridge multi-level inverter and a H-bridge multi-level inverter power cell charging method using the same.

The inverter converts the AC power to DC and then reconverts it into an alternating current capable of varying the magnitude and frequency of the voltage. A capacitor is used for smoothing the voltage in the DC part.

When power is first applied to the inverter, a large inrush current flows through the capacitor, so an initial charging circuit (means) is required to limit this.

Unlike a 2-level inverter or a 3-level inverter with only a single dc part, an H-bridge multilevel inverter connecting a single-phase inverter (power cell) in series and outputting a high voltage will limit the initial inrush current of the capacitors installed in each power cell. There is a problem in that a charging circuit is required.

Herein, a DC capacitor initial charging method of a conventional multi-level inverter will be briefly described.

The initial charging method of the DC capacitor of the multilevel inverter is classified into a power cell individual charging method and a power cell bulk charging method, and the power cell bulk charging method is classified into a first method to a third method.

First, the power cell individual charging system is a system in which a charging circuit is installed in each of all the power cells used in the multilevel inverter. This method has a problem in that the production cost and volume of the power cell are increased, and the fault generating element is increased due to the thyristor and thyristor driving circuit used in the charging circuit.

Next, the first of the power cell batch charging schemes uses a percentage (%) impedance of the input multi-winding transformer using the input multi-winding transformer percentage (%) impedance for the multilevel inverter, And the initial charge current is limited by the reactance by the impedance component.

However, in the first method, the magnitude of the impedance must be different for each inverter capacity, and the inductance value varies depending on the power frequency and the current capacity, so that the initial charge current limit is not constant.

In the second method, a charging circuit is formed by adding a multi-level inverter input reactor. In the case of the second method, a reactor is connected to a multi-level inverter input portion to which a voltage of 3.3 kV or more and a maximum voltage of 13.8 kV is applied. And the contactor must be installed, which leads to an increase in manufacturing cost and size of the inverter.

Finally, the third type of power cell batch charging method is a method of constructing an initial charging winding and a charging circuit in an input multi-winding transformer. This method increases the cost of manufacturing a transformer by adding a charging winding of an input transformer, There is a problem that a separate power source must be supplied to the inverter for charging. Therefore, this method can not be used if separate power supply is not possible according to installation site conditions.

Korean Patent Laid-Open Publication No. 10-2015-0005822

A problem to be solved by the present invention is to charge the power cells in the H-bridge multi-level inverter collectively, to eliminate the necessity of installing a charging circuit in the power cell, and to charge the power cell regardless of the percentage (%) The present invention also provides a charging device for an H-bridge multilevel inverter that does not require a high-voltage reactor and a contactor and requires no separate power supply for additional winding and charging of a transformer, and a power cell charging method using the same.

The charging device for an H-bridge multi-level inverter according to an embodiment of the present invention is a charging device for an H-bridge multi-level inverter charging an H-bridge multi-level inverter to which system power is applied through a power input device, A transformer for converting the voltage into a set size; A switching unit for applying or interrupting the inverter control power converted into the predetermined magnitude through the switching operation to any one of the input transformer secondary multi-winding of the H bridge multi-level inverter; And a controller for controlling the operation of the switching unit according to whether the system power is applied through the power input device.

In one embodiment, when the power input device does not apply the system power supply to the H bridge multi-level inverter, the controller turns on the switching unit so that the inverter control power converted into the predetermined size is supplied to the H And charges the dc capacitors of each of the power cells provided in the bridge multi-level inverter collectively.

The method of charging an H bridge multi-level inverter power cell according to an embodiment of the present invention includes: turning on / off of a power input device for applying an externally supplied system power to an input transformer of an H bridge multi-level inverter based on an inverter main power input command; Determining whether an operation is performed; Turning on the switching unit so that the dc capacitor of the power cell provided in the H bridge multi-level inverter is charged through an externally supplied control current when the power input device is determined to be in the off state; And turning off the switching unit when the capacitor is charged. When the switching unit is off, the system power is applied to the H bridge multi-level inverter.

Using the H-bridge multi-level inverter charging apparatus and the H-bridge multi-level inverter power cell charging method using the same according to an embodiment of the present invention, power cells in an H-bridge multi-level inverter are collectively initial charged, It has an advantage that the inrush current generated in the capacitor can be suppressed when the power is first applied.

In addition, it is unnecessary to install a separate charging circuit in the power cell, charging is possible irrespective of the percentage (%) of the transformer, no high voltage reactor and contactor for initial charging are required, There is an advantage that a separate power source is unnecessary.

1 is a view illustrating a charging apparatus for an H-bridge multi-level inverter according to an embodiment of the present invention.
FIG. 2 is a flowchart illustrating a method of charging an H-bridge multi-level inverter power cell using the charging device for the H-bridge multi-level inverter shown in FIG.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in order that those skilled in the art can easily carry out the present invention. In the following detailed description of the preferred embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In the drawings, like reference numerals are used throughout the drawings.

In addition, in the entire specification, when a part is referred to as being 'connected' to another part, it may be referred to as 'indirectly connected' not only with 'directly connected' . Also, to "include" an element means that it may include other elements, rather than excluding other elements, unless specifically stated otherwise.

Hereinafter, a charging apparatus for an H-bridge multi-level inverter according to an embodiment of the present invention and a method for charging a power cell of a multi-level inverter using the same will be described in detail with reference to the drawings.

First, before explaining the present invention, an H-bridge multilevel inverter will be briefly described.

1, the H-bridge multilevel inverter 10 is a variable-speed device of a high-voltage motor. The H-bridge multilevel inverter 10 includes an input transformer 20 connected to the power supply system PL and an output voltage of the secondary multi- And a plurality of power cells P1 to P18 used as the power cells.

The output voltages of the plurality of power cells P1 to P18 are connected in series to each phase, and each of the power cells P1 to P18 has an independent single-phase inverter structure including a capacitor which is a DC link. By connecting the outputs of several power cells (P1 to P18) in series, a high voltage can be obtained by using a semiconductor for low voltage power.

1 is a view illustrating a charging apparatus for an H-bridge multi-level inverter according to an embodiment of the present invention.

1, a charging apparatus 100 for an H-bridge multi-level inverter according to an embodiment of the present invention is configured to supply system power (Vr, Vs, Vt) supplied from the outside to H In accordance with the OFF operation of the power input device 30 applied to the input transformer 20 of the bridge multi-level inverter 10, the inverter control power supplied from the outside is supplied to the secondary multi-winding (CH_TR), the resistance unit (CHR), and the switching unit (CHR) so as to perform the function of charging the capacitor, which is a DC link of the power cell, by applying the voltage to the plurality of power cells (P1 to P18) (CHK) and a control unit 110. [

In FIG. 1, the number of the secondary windings of the input transformer 20 for supplying the input power of the plurality of power cells is equal to the number of power cells, and the specification of the windings is also the same. Therefore, when the voltage is applied to one of the secondary windings of the transformer, the same voltage is applied to all of the multiple windings. Accordingly, since power is input to all of the plurality of power cells, the initial charge current 1 through the switching unit CHR shown in FIG.

This is because the primary charging winding of the input transformer plays the role of replacing one of the secondary windings of the input transformer 20 of Fig. 1 in three of the batch charging methods, so that no additional initial charging winding is installed in the input transformer Bulk charging is possible.

Here, the transformer CH_TR controls the magnitude of the predetermined inverter control power provided from the outside.

The switching unit CHK functions to apply or cut off the inverter control power applied to the transforming unit CH_TR through the on / off operation to the predetermined power cell P18 of the H bridge multi-level inverter 10 .

The controller 110 controls the on / off operation of the switching device according to the on / off operation of the power input device 30. [

FIG. 2 is a flowchart illustrating a method of charging an H-bridge multi-level inverter power cell using the charging device for the H-bridge multi-level inverter shown in FIG.

2, the H bridge multi-level inverter power cell charging method (S100) supplies the externally provided system power supply (Vr or Vs or Vt) to the H bridge multi-level inverter 10 based on the inverter main power input command, When the power input device 30 is determined to be in the off state (S120) after determining whether the power input device 30 to be applied to the input transformer 20 of the H- A capacitor C which is a DC link of the power cells P1 to P18 provided in the multilevel inverter 10 is turned on at step S130 so that the capacitor C is collectively charged at an initial stage through an inverter control current provided from the outside.

Thereafter, when the capacitor is charged (S140), turning off the switching unit CHK (S150).

When the switching unit CHK is turned off, the power input device is turned on (S150), and the system power supply (Vr, Vs, or Vt) is applied to the H bridge multilevel inverter 10.

Therefore, using the charging device for the H multi-level inverter and the method of charging the power cell using the H multi-level inverter according to an embodiment of the present invention, power cells in the H multi-level inverter can be collectively charged at an initial stage.

It also eliminates the need to install a charging circuit in the power cell, allows recharging regardless of the percentage (%) of the transformer impedance, eliminates the need for high-voltage reactors and contactors, and eliminates the need for separate power supplies for additional transformer winding and charging. do.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the present invention is not limited to the disclosed exemplary embodiments, but various changes and modifications may be made without departing from the scope of the present invention.

Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but are intended to illustrate and not limit the scope of the technical spirit of the present invention. The scope of protection of the present invention should be construed according to the claims, and all technical ideas which are within the scope of the same should be interpreted as being included in the scope of the present invention.

10: H bridge multi level inverter
20: Inverter input transformer
30: Power input device
100: H bridge Charging device for multi-level inverter

Claims (3)

A charging device for an H-bridge multi-level inverter charging an H-bridge multi-level inverter to which system power is supplied through a power input device,
A transformer for converting the inverter control power into a predetermined size;
A switching unit for applying or interrupting the inverter control power converted into the predetermined magnitude through the switching operation to any one of the input transformer secondary multi-winding of the H bridge multi-level inverter; And
And a controller for controlling the operation of the switching unit according to whether the system power is applied through the power input device.
The apparatus of claim 1,
When the power supply input device does not apply the system power supply to the H bridge multilevel inverter, the switching unit is turned on so that the inverter control power converted into the predetermined size is supplied to the H bridge multilevel inverter Charging device for an H-bridge multi-level inverter which collectively charges capacitors which are DC links of respective cells.
Determining whether the power input device is turned on / off by applying an external system power source to an input transformer of an H-bridge multi-level inverter based on an inverter main power input command;
Turning on the switching unit so that a capacitor, which is a DC link of a power cell provided in the H bridge multi-level inverter, is charged through an externally supplied control current when the power input device is determined to be in an OFF state; And
And turning off the switching unit when the capacitor is charged,
Wherein the system power is applied to the H-bridge multilevel inverter when the switching unit is turned off.
KR1020150091354A 2015-06-26 2015-06-26 Charging device for H-bridge level inverter and method for charging power cell of H-bridge Multi level inverter using the same KR102056239B1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200017491A (en) * 2017-06-16 2020-02-18 티에이이 테크놀로지스, 인크. Multilevel Hysteresis Voltage Controller for Voltage Modulator and Its Control Method
CN112937345A (en) * 2021-03-25 2021-06-11 国文电气股份有限公司 High-power split type multi-gun integrated charging system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150005822A (en) 2013-07-05 2015-01-15 현대중공업 주식회사 Apparatus and method of controlling instant power failure of h-bridge multi-level inverter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101401210B1 (en) * 2012-11-30 2014-05-28 주식회사 포스코아이씨티 Controlling system for multi level inverter and controlling method for the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150005822A (en) 2013-07-05 2015-01-15 현대중공업 주식회사 Apparatus and method of controlling instant power failure of h-bridge multi-level inverter

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200017491A (en) * 2017-06-16 2020-02-18 티에이이 테크놀로지스, 인크. Multilevel Hysteresis Voltage Controller for Voltage Modulator and Its Control Method
US11626791B2 (en) 2017-06-16 2023-04-11 Tae Technologies, Inc. Multi-level hysteresis voltage controllers for voltage modulators and methods for control thereof
US11881761B2 (en) 2017-06-16 2024-01-23 Tae Technologies, Inc. Multi-level hysteresis voltage controllers for voltage modulators and methods for control thereof
CN112937345A (en) * 2021-03-25 2021-06-11 国文电气股份有限公司 High-power split type multi-gun integrated charging system
CN112937345B (en) * 2021-03-25 2022-07-01 国文电气股份有限公司 High-power split type multi-gun integrated charging system

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